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daj95376
Joined: 23 Aug 2008
Posts: 3854
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 Posted: Fri Aug 12, 2011 6:18 pm Post subject: Puzzle 11/08/12: ~ XY (BBDB?) |
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| Code: | +-----------------------+
| 8 . . | . 9 . | . . 1 |
| . 9 . | 1 4 . | . . 8 |
| . . . | 3 . . | . . . |
|-------+-------+-------|
| . 5 9 | . . . | 8 3 . |
| 4 8 . | . 3 9 | . . 5 |
| . . . | . 5 . | 4 . 9 |
|-------+-------+-------|
| . . . | 7 . 3 | 1 . . |
| . . . | 5 . . | . 8 . |
| 1 7 . | . 8 4 | . . 6 |
+-----------------------+
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Play this puzzle online at the Daily Sudoku site |
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susume
Joined: 13 May 2011
Posts: 36
Location: Southeastern US
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| Posted: Fri Aug 12, 2011 10:02 pm Post subject: |
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| Quote: | X wing 7 r34c59; r34c16<>7
X wing 2 r34c19; r34c5<>2
DP (26)(67)(27)r34c159; r4c5=1 |
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ronk
Joined: 07 May 2006
Posts: 398
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| Posted: Fri Aug 12, 2011 11:25 pm Post subject: |
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| susume wrote: | | Quote: | | DP (26)(67)(27)r34c159; r4c5=1 |
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susume, the rows need to "play" in the same band. |
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susume
Joined: 13 May 2011
Posts: 36
Location: Southeastern US
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| Posted: Sat Aug 13, 2011 12:05 am Post subject: |
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I think you mean I used too many boxes? Bother. Thanks for setting me straight.
edit: Hopefully this will recover a shred or two of my dignity:
X wing 7 r34c59
X wing 2 r34c19
S wing 72 (7)r4c9 =r4c5 -(7=2)r6c6 -r5c4 =(2)r5c7; r4c9<>2=7
If that's another blunder, I'll just crawl under a rock for a while.
~Sue |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sat Aug 13, 2011 7:30 am Post subject: |
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A move with unexpextedly lucky consequence 
I found this x-cycle/fish...
| Code: | | (6)r5c4=r1c4 - r3c5=r3c1 - r4c1=r4c56 -loop => (6)r4c56=r5c4 |
...but its impact is on the als(27) in r4 and b6...
| Code: | | als(27=6)r4c19 - (6)r4c56=r5c4 - als(6=27)r5c7|r4c9 ; r12c6<>6, r26c1<>6, r6c6<>6, r4c56<>7 |
(In fact the last strong link on 6 is extraneous for the eliminations on 7 but more fun!)
[dajEdit: corrected mismarked cells.] |
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ronk
Joined: 07 May 2006
Posts: 398
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| Posted: Sat Aug 13, 2011 1:00 pm Post subject: |
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Almost the same as susume's ...
x-wing(7)c59\r34 ==> r3c138, r4c16<>7
x-wing(2)c19\r34 ==> r3c2358, r4c56<>2
w-wing: (2=6)r4c1 - r6c23 = r6c8 - (6=2)r5c7 ==> r4c9<>2 ste
It took a few naked pair and locked candidate moves too, but it appears accepted practice is to not list basic moves. If this is correct, where is the line drawn?
I used the iPad app 'EnjoySudoku' (by JasonLion) while sitting outside with the dogs. Very nice fun-to-use app. One drawback: I didn't find a way to copy&paste the puzzle. |
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Luke451
Joined: 20 Apr 2008
Posts: 310
Location: Southern Northern California
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| Posted: Sat Aug 13, 2011 1:59 pm Post subject: |
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| susume wrote: | I think you mean I used too many boxes? Bother. Thanks for setting me straight.
edit: Hopefully this will recover a shred or two of my dignity:
X wing 7 r34c59
X wing 2 r34c19
S wing 72 (7)r4c9 =r4c5 -(7=2)r6c6 -r5c4 =(2)r5c7; r4c9<>2=7
If that's another blunder, I'll just crawl under a rock for a while.
~Sue |
Nice recovery!
Don't feel bad at all for mistakes. Posting public blunders is how I learned half of what little I know. Even when one is right, others can point out nuance or improvements that flesh out one's understanding of things.
The three horizontal chutes in a grid are called bands.
The three vertical chutes are called stacks.
The DP you were going for was a BUG-Lite and that type of BUG-Lite is confined to the three boxes of a band or stack. |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Sat Aug 13, 2011 3:03 pm Post subject: |
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| ronk wrote: | It took a few naked pair and locked candidate moves too, but it appears accepted practice is to not list basic moves. If this is correct, where is the line drawn?
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The Basics from my ratings list are used to draw the line. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Aug 14, 2011 4:32 am Post subject: |
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| Potential 16 DP, boxes 58, common outcomes; r4c9, r6c6 = 7. |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sun Aug 14, 2011 9:00 am Post subject: |
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| Marty R. wrote: | | Potential 16 DP, boxes 58, common outcomes; r4c9, r6c6 = 7. |
Marty, for others who are a bit "telepathically challenged" I had a go at writing this move down for the "non notationally challenged" 
| Code: | ur(16)r48c56
(6)r4c1 - r3c1=r3c5 - r1c4=r5c4 - (6=2)r5c7 ; r4c9<>2=7
||
(6)r7c5 - r3c5=r3c1 - (6=27)r4c19 - (7)r4c5=r3c5 - (7=2)r3c9 ; r4c9<>2=7 |
At least for 4c9... I think!
Last edited by peterj on Sun Aug 14, 2011 5:05 pm; edited 1 time in total |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Aug 14, 2011 3:56 pm Post subject: |
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| peterj wrote: | | Marty R. wrote: | | Potential 16 DP, boxes 58, common outcomes; r4c9, r6c6 = 7. |
Marty, for others who are a bit "telepathically challenged" I had a go at writing this move down for the "non notationally challenged"
| Code: | ur(16)r48c56
(6)r4c1 - r3c1=r3c5 - r1c4=r5c4 - (6=2)r5c6 ; r4c9<>2=7
||
(6)r7c5 - r3c5=r3c1 - (6=27)r4c19 - (7)r4c5=r3c5 - (7=2)r3c9 ; r4c9<>2=7 |
At least for 4c9... I think! |
Well, your response is much more satisfying than what I often get (euphemistically) from various members, "Marty, I'm unable to replicate your solution."
I don't understand why a 6 is at the start of each notation line, since the UR was 16 and I was testing other numbers, a so-called "internal analysis."
Also, what does that symbol mean, the parallel bars between the two lines of notation? |
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susume
Joined: 13 May 2011
Posts: 36
Location: Southeastern US
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| Posted: Sun Aug 14, 2011 4:00 pm Post subject: |
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Thank you Peter, and nice find, Marty.
Peter, where you have (6=2)r5c6 I wonder if you mean (6=2)r5c7?
~Sue
edit: The double bar || is a sideways equal sign, or strong link. Here it means "Either (6)r4c1 is true or (6)r7c5 is true" (those being the cells that can break the DP by pulling a 6 out of it, and for which Peter found matching outcomes). |
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peterj
Joined: 26 Mar 2010
Posts: 974
Location: London, UK
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| Posted: Sun Aug 14, 2011 5:09 pm Post subject: |
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Susume, thanks for pointing out the typo - my second on this puzzle!
Marty, as Sue indicated it seemed easier using an "external analysis" rather than an internal one - but maybe not, I didn't really look. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Aug 14, 2011 7:39 pm Post subject: |
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OK, I did the basics again via Draw/Play and came up with this:
| Code: |
+------------------+--------------+---------------+
| 8 2346 24567 | 26 9 2567 | 2356 24567 1 |
| 2367 9 2567 | 1 4 2567 | 2356 2567 8 |
| 267 1246 124567 | 3 267 8 | 2569 24567 27 |
+------------------+--------------+---------------+
| 267 5 9 | 4 1267 1267 | 8 3 27 |
| 4 8 17 | 26 3 9 | 26 17 5 |
| 2367 1236 1267 | 8 5 267 | 4 1267 9 |
+------------------+--------------+---------------+
| 5 26 8 | 7 26 3 | 1 9 4 |
| 9 246 246 | 5 126 126 | 7 8 3 |
| 1 7 3 | 9 8 4 | 25 25 6 |
+------------------+--------------+---------------+
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Play this puzzle online at the Daily Sudoku site
I didn't see at the time that an external analysis could be done using just two possible 6s. With my internal, I had the 2s, of course, in r8c56 and the pseudo cell 27 (is that a quantum pair?) in r4. Thanks for clarifying things Peter. |
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Marty R.
Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
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| Posted: Sun Aug 14, 2011 7:41 pm Post subject: |
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| susume wrote: | | Quote: | X wing 7 r34c59; r34c16<>7
X wing 2 r34c19; r34c5<>2
DP (26)(67)(27)r34c159; r4c5=1 |
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Susume, not that it's a big deal, but most of us have stopped using the whiteout on the theory that we don't read the threads until after we do the puzzle. |
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daj95376
Joined: 23 Aug 2008
Posts: 3854
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| Posted: Mon Aug 15, 2011 2:24 am Post subject: |
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| Marty R. wrote: | | Code: | ur(16)r48c56
(6)r4c1 - r3c1=r3c5 - r1c4=r5c4 - (6=2)r5c6 ; r4c9<>2=7
||
(6)r7c5 - r3c5=r3c1 - (6=27)r4c19 - (7)r4c5=r3c5 - (7=2)r3c9 ; r4c9<>2=7 |
Also, what does that symbol mean, the parallel bars between the two lines of notation? |
The parallel bars mean ... OR. In this case, they mean: either r4c1=6 or r7c5=6 must be true. |
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